An Astronomer.
An Astronomer is a scientist who studies the stars and planets.
an actor or actress. the guys in the background are called extras
A scientist who studies stars is called an astronomer, while a scientist who studies plants is known as a botanist. If the focus is specifically on the interplay between stars and plants, such as how stellar phenomena affect plant life on Earth or elsewhere, this could involve fields like astrobiology or astrophysics in the context of ecology. However, there isn't a specific title for someone who solely focuses on both stars and plants simultaneously.
Temperature
astronomer
These people are called Astronomers. Look it up in wikipedia if you want more information.
An astronomer.
astronomer
spectroscope
Telescope
An insect scientist is called an entomologist.
its an astronomer